A USB-powered coffee cup warmer advertised on Amazon claims to have a heating plate that reaches 85°C when there is no cup placed on it. What is the electrical power required for this? Assume the device is 100% efficient at converting electrical power to heat in the plate and that heat from the plate is lost to air from the top surface of the heating plate only. Take ambient temperature to be 20.0°C, the diameter of the plate to be 10.0 cm, the convection coefficient from the plate to air to be 7.1 W/(m2.K), and take the emissivity of the plate to be 1.0.

A USB-powered coffee cup warmer advertised on Amazon claims to have a heating plate that reaches 85°C when there is no cup placed on it. What is the electrical power required for this? Assume the device is 100% efficient at converting electrical power to heat in the plate and that heat from the plate is lost to air from the top surface of the heating plate only. Take ambient temperature to be 20.0°C, the diameter of the plate to be 10.0 cm, the convection coefficient from the plate to air to be 7.1 W/(m2.K), and take the emissivity of the plate to be 1.0.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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